Em4, LLC
7 Oak Park Dr, Bedford, MA 01730
Operating signal within 12 months from two or more independent sources.
What they make
Semiconductor and Related Device Manufacturing334413EM4 manufactures photonic components including DFB lasers and modules, fiber coupled pump lasers, planar lightwave circuits, photodetectors, and optical collimators. The products are available in various configurations such as cooled and uncooled multi-mode lasers, single mode pump lasers, and laser drivers with integrated components.
SUMMARIZED FROM THE COMPANY’S OWN WEBSITE
Where it is
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Also at this address
No other federal record shares this street address.
WHERE THIS RECORD COMES FROM — 3 FEDERAL SOURCES, 9 FIELDS
Every fact on this page traces to a public federal filing. The table below names which register holds this facility, whether that register proves the plant operates or only that it exists, and when each of them last saw it.
| Source | Evidence | First seen | Last seen |
|---|---|---|---|
| COMPANY SITE | OPERATING | JUL 2026 | AUG 2026 |
| SAM GOV | OPERATING | MAR 2026 | MAR 2026 |
| OSHA ITA | OPERATING | DEC 2025 | DEC 2025 |
FIELD BY FIELD — WHICH SOURCE SUPPLIED WHAT
| FIELD | SOURCE | SIGNAL |
|---|---|---|
| ADDRESS LINE1 | SAM GOV | MAR 2026 |
| CAGE CODE | SAM GOV | MAR 2026 |
| CITY | SAM GOV | MAR 2026 |
| EMPLOYEE BAND | OSHA ITA | DEC 2025 |
| GEOM | CENSUS GEOCODER | JUL 2026 |
| NAME | SAM GOV | MAR 2026 |
| REGISTRATION EXPIRATION | SAM GOV | MAR 2026 |
| STATE | SAM GOV | MAR 2026 |
| WEBSITE | SAM GOV | MAR 2026 |
Status is computed from independent sources; nothing here is self-reported unless marked Claimed.